Cutter.



E. LAWRENZ. GUTTER.

APPLICATION FILED MAY 31, 1912.

1,073,254. Patented sept. 16,1913.

gi/Mg WJTNESSES A JNVENTOR.

EMIL LAWRENZ, orY DnfrnoIT, ivrIoHIcuiN.Y

corran.

ASpecification ofiletters Patent. Ptggelispt; 1913,

Application ledMay 31, 1912; SeriaLNo. 700,575.l 1:

To all whom it may concern.'

Be it known that I EMIL LAwRnNz, a citi-1` zen of the'United States,residing at De-` troit, in the county o-f Wayne and `State of Michigan,have invented cert-ain new and useful Improvements in Cutters, of whichthe following is a specification. Y

This invention relates to cutters andmoreV especially to that classthereof `which may be utilized in connection with last-turning lathes,and it has for one of its objects the provision of a cutter-headcomprisin a series of cutters for acting upon the b ock to be turned insuch a manner as to out away t-he superfiuous material of the block to agreat extent so that another cutter-head comprising one or morefinishing cuts, may then be enabled to reduce the block to substantiallyfinished size and shape. Y

The invention has, furthermore, for its object the provision of such aprimary cutter-head in which a series of knives are held and positionedso as to cut the stock in adjacent lateral planes relatively to ltherotation axis of the block or work, and so that each knife will removeonly a comparatively small amount of the block longitudinally of theaxis thereof.

A further object of the invention resides in novel means for bringingsame into required adjustment as to radial distance from a cutter axis,and in improved means for holding the knives in adjusted positions.

Further objects of the invention will hereinafter appear and beparticularly defined in the claims.

The invention has been clearly illustrated in Vthe accompanying drawingsin which similarcharacters denote similar parts and in which- Figure 1isa face view of a cutter-head embodying my invention. Fig. 2 is an edgeview thereof, partly brokenfaw'ay. Fig. 3 is a top view of one of theknives. Fig. 4 is a cross section on line 4 4 of Fig. l.

Briefly stated the present invention is de-` signed to avoid theobjections heretofore met in devices of this character, in thege'nerallyadopted forms of which each knife has to be filed in order to bringabout the required adjustment when the cutting edge became worn. Inmachines of the character mentioned, the cutters are rotated at a veryhigh velocity always, the outward pull on the knives becomes'atremendous one, not

only on account 0f the centrifugal forceV ,which manifests itself juponeach individual knife.

\ Referring nowto the drawings,l0 denotes the cutter-head mounted uponthe spindle l1 which constitutes part of the machine. Carried by thehead 10, are a series of progressive-ly operated knives 12, 12b, 12C,12d,

`and .128, each of which has its shank portion 13 seated within a groove14 provided therefor in the head `10,. this groo-ve being "slightlydeeper than t-he shank of the knife and having its` sidewalls milledaway as indicated at15 to receive a washer 16, which latter is thus heldagainst slippinc movement in the groove, and may be heldnagainst upwardmovement by a bolt 17 in screwthreaded engagement with the main body ofthe head 10 as shown in Figs. 2 and 4, it being understood that thisbolt passes through the shank 13 of the knife as for instance through anelongated aperture 18 so as to permit outward radial adjustment of eachknife.

As above stated the knives are exposed to a tremendous outward pull whenin active operation, and for this reason means are provided whereby eachknife, or rather the shank portion thereof, is rmly held againstaccidental displacement, these means consisting preferably of a pair ofdiametrically opposite teeth 19 provided on the under-side of the washer16 and adapted to engage any one of a series of lateral grooves 20provided in the upper surface of each knife shank which is furthermorefitted closely between the side-walls of the groove 14 of thecutter-head. From the above it will be clearly seen that each knife ispositively locked in position on the head.

In the present instance the cutter-head is rotatable in the direction ofarrow a, and the knives 12a, 12b, 12C, 12d, 12e, become successivelyoperative upon the work in the order named, z'. c. in the longitudinalaxial tre vel of the cutter-head relatively to the head, while at thesame time they cut progressively deeper into the end of the block, as isclearly indicated in Fig. 2 in which the block or work is indicated byW, and the several cuts produced 'by the knives are indicated by theseveral lines generally denoted by c.

It is to be understood that the particular formation of the knives maybe changed aocording to various requirements, and also that they may beseated rela-tively to the center in different Ways so asto `full theconditions to be met. lIn the present in- Vstancve the knives are soset, that their center lines are slightly in advance of a line e.

idrawn in parallelism thereto through center of therhead 10.: Otherchanges may alsov be Vmade in the particular construction Ysubstantially radial` groove,'o fia knife blade having. a yshank 1 ofless depth ythan lthe groove, -a Washer sldewlse overlappingwthe shankand vin locked :engagement withy said shank and lintersectingasidehvv'allI osaid groove,iandl1neansor draw-lng sald washer .and the`knifeblade into rm Contact Ywith the head. Y Y

Gopesmfithis'patentfmay bewlitainedforve cents each, by;-ddressingthe'fcninmissioner' of-Patents..`

2."The corr1bination vvith a head'having a 20V substantially radialgroove, of a knife hav# ing a shankiittedorlongtudinal move-y A.ment insaid groove and having a thickness less lthan the depth of said groove,a series of indentatons in the outer face of4 saidrr25 findentations,said Washer also intersecting Y Ethe sides of and seatedainsaidgroovdandl mea-ns for drawing-said Washerand shank 3 into tighteligagernent--Withlthe head. vln: testimony whereof-Itaixnmy signature2in, presence :of tW'o Witnesses.Y y EMI-L Lawn-ENZ. l

-lV-tnesses H.D. MAoDoNALD, Guns. F.-SoHMELz.

